Spring assembly



Nov. 8, 1932. F. KARR SPRING ASSEMBLY Filed Deo. 21. 1927l Patented Nov.' 8, -1932 FRANCIS KARB, F HOLJAND, MICHIGAN s P-RING ASSEMBLY Application filed December 21, 1927. Serial No. 241,529.

This invention relates to spring assemblies and more particularly to spring assemblies for cushions, bed springs and the like.

@ne of the objects bf the invention is the provision of new and improved means for attaching connecting helicals to the spirals of a spring assembly suitable for cushions, and the like. A Another object of the invention is the provision of new and improved means for attaching connect-ing helicals to spirals for forming cushions and the like which will prevent noisy clickings of the connecting parts in using the spring assembly.

e A further object of the invention is the provision of a new and improved spring assembly that is cheap to manufacture, simple in construction, easily assembled, noiseless in use. and that is not likely to become broken '-fl or deranged.

Other and-further objects and advantages of the invention will appear from the following description taken in connection with the accompanying drawing, in which Fig. 1 is a plan view of a portion of' a spring assembly showing the invention in position thereon; Y

Fig. 2 is a section on line 2-2 of Fig. 1; and

Fig. 3 is a plan view of a portion of a spring assembly showing a modified form of construction.

In the construction of spring assemblies in which the spiral springs constituting the resilient parts of the assemblies are connected together by helicals, great difliculty has been experienced in preventing unnecessary movement and consequent noise of the parts embraced by -the helicals during the use of the springs. In order to avoid this diiiiculty, it .has been' proposed to employ a third member extending through the helicals for assisting :in filling the coils of the helicals to prevent unnecessary movements ofl the -terminal turns ofthe spirals contained in said helicals, butthis'neeessitates the use of these additional elements. Other methods have been proposed, but where a third member is -not employed the parts of the spirals con- 1'". tained within the coils of the helicals will slip or snap past each other with a disagreeable snap or metallic click during the use of thc assembly, and for that reason such methods are objectionable.

The present invention seeks to avoid these diiiculties'by so arranging the portions of the spiral springs embraced by the helicals that it is impossible for those parts to slip past each other in the normal use of the device, while at the same time preventing the '60 rotation of the spirals.

Referring now to the drawing, in which similar reference characters are employed to designate the same parts throughout the description, the reference character 10 desig- .6 nates generally the resilient spring assembly which may be and preferably is a construction' or assembly suitable for use in cushions, mattresses or the like.

The assembly comprises a plurality of rows ot' spiral springs 11, only two rows bein-g shown on the drawing for illustrative purposes. The terminal turn or coils of each spiral at each end thereof is provided with what for convenience of description will be termed an inner ofsetportion 12 at' one side of the spiral and with an outer offset portion 13 at the opposite side of the spiral. The end 14 of the terminal turn or coil may be return'bent as at 15 for preventing the withdrawal of the end from the helical. The offset sections are provided with angular portions 16 and 17 forming shoulders for engaging turns or coils of the connecting helicals for preventing rotation of the spirals, as will presently appear.

The connecting parts of the oset portions of the springs are distorted in the plane of the terminal coils as by being bowed or curved as at- 18 and 19 in order that when the parts are assembled they will be held from snapping past each other and producing objcctlonable noises while in use. 'In other words, the combined horizontal overall width of the lapping portions is such that during the normal use of the assembly those portions lwill be prevented from snapping lvertically past each other by the connecting helical 'as will presently appear.

The spirals are arranged in rows with the cals 21.are threaded onto the overlapping portions.l The internal diameters of the sp1- rals are but slightly greater than the com-l bined diameters of the wires forming the spirals, whereby when the helicals are in posievident from an inspection of Fig. 1.

tion on the offset portions of the spirals the curves in those offset portions .will prevent the same from passing each other as will be ends of the' bowed or curved portion of each 'odset willl engage the coils of the helical at .one side thereof and the intermediate or bowed `portionwill'engage the coils of the coils of one row over-lapping those of anl adjacent row, and a helical closely embracing said curved portions andholding them per-4 manently inover-lapping relation, and en- "Thevgaging said shoulders, thereby preventing rotation of the corresponding springs.

2. In a spring assembly, spiral springs arranged in rows, each spring being provided vwith a distorted portion in its-terminal coil helical at the opposite side, whereby it will. forming shoulders, the distorted portions of beimpossible for one bowed or curved portion to pass the other under normal conditions. They can be made to pass each other by moving the parts, say downward untilthe the springs as indicated more clearly in Fig.

Q By means of this arrangement a spring assembly is produced that is practically noiseless in use and one that may be assembled with a minimum of skill and labor.

The marginal edge of the assembly may be defined by the helical 27 encircling the bowed portions 18 and 19 at each end of the marginal springs, and which may be of the same diameter as the helicals 21.

The rform of construction shown in Fig. 3 differs from that described abovein thatthe ends of the springs are knotted, that is they are secured to the Inext adjacent inner turn or coil as 22 as at 23 instead of being return bentto form a loop as in Fig. 1. The spirals 24 are provided with ofset portions 25 and 26 corresponding to the o fset portions 12 and 13, respectively, of the previously described the springs lapping the terminal coils of the adjacent springs of the same row and helicals encircling the portions that are lapped, Vthe internal diameter of the helical being slightly greater than the' combined diameters of the wires of the spring coils, whereby said helicals will hold -the lapped portions in lapped position, said helicals engaging .said

shoulders, thereby preventing rotation of said springs.

3. In a spring' assembly, a plurality of 'spiral springs, each spring having its terminal coil provided with shoulders and lapping the .terminal coil of an adjacent spring, helicals encircling Athe entire lapped portions of .said coils and holding them in lapped position, the internal diameter of the helical being slightly greater than the combined diameters of the wires of the spring coils, said helicals engaging said shoulders, thereby preventing rotation of said springs.

1 1. In a spring assembly, a plurality of spiral springs, each spring having its terminal coil provided with distorted portions havf ing shoulders at cach side thereof, the terminal coils of adjacent springs lapping each other, helicals encircling the lapped portions of said springs and holding them lin lapped position, the lapped portion of each coil engaging opposite portions of the interior of said helicals for preventing relative movement thereof, and said helicals engaging said shoulders thereby preventing rotation of said spirals.

In testimony whereof I aix my signature.

. FRANCIS KARR.

Since the remaining parts arel proportion and details of construction may be made without departing from the spirit and scope ofthe appended claims. l

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